Repeater system



Feb. 28, 1933. A, T JESTER 1,899,037

REPEATER SYSTEM Filed Nov* 6, 1951 Patented Feb. 28, 1933 UNITED STATES .PATENT OFI-ics ALFRED T; JnsTER, or HOUSTON, TEXAS REPEATER SYSTEM Application filed November 6, 17931. Serial No. 593,417.

1, ments arranged in pairs each such element -having a coil and the elements being so arranged that one of the coils of the pair of elements will attract a common armature `of both elements, this coil, however, having such a high resistance that the current necessary for4 the energization of this coil will not be suincient to energize any of the relay Sounders on the telegraph line, the coil of the other element of the pair being so arranged under the control of the sending keys as to bypass the high resistance coil and maintain the armature attracted to thereby transmit the impulses toward the other end of the line.

I will explain my invention in detail by reference to the accompanying drawing in which- Fig. 1 is a diagrammatic representation of the repeater associated with the telegraph line' 2 is a similar representation showing a modied form of the repeater circuit; and

Fig. 3 illustrates a further modification embodying the invention.

Referring more particularly to Fig. 1, I show a repeating station A as adapted to repeat messages between two Oppositely eX- tending telegraph lines marked `1 and 2, respectively, which telegraph lines may be provided, of course, with one or more of the ordinary series telegraph sets. One station only for each line is shown, however, these being referred to as stations B and C, respectively. These stations serve to indicate the character of the vapparatus at each of such ordinary telegraph stations. The line 1 is provided with the usual telegraph relay 3 which controls the customary sounder (not shown), the .sending key 4 and battery 5 connected to ground at 6. The line 2 is provided with similar apparatus consisting of relay 7,

sending key 8, and battery 9, grounded at 10. At the repeating station I have a pair of armatures 11 and12 provided with front contacts 13 and 14,'respectively. Retractile springs 15 and 16 retract these armatures. 55 Armature 11 is attracted by the two electro.- magnets 17 and 18 having coils 19 and 20, respectively, coil 19 being a holding coil and preferably having a very high resistance,l

.for example about 100,000 ohms. Armature '60 12 is attracted by the two electromagnets 21 and 22 having coils 23 and 24 thereon. Coil 23 is high resistance holding coil like 19. Coils 2O and 24 are relatively low resistance line coils of a standard low resistance suchl as 150 ohms. Line 1 is connected directly to coils 19 and 20, and line 2 is connected directly to coils 231 and 24. The free end of coil 19 is connected over line 25 and through battery 26 to ground at 27. Armature 12 is 7o also connected to battery 26. The free end of coil 23 is. connected over line 28 through battery 29 to ground at 30'. Armature 11 is also connected to battery 29. The free end of coil 20 is connected by conductor 31 t0 75 Contact 14, and the free end of coil 24 is connected by cfonductor 32 to contact 13. Conductor 33 `connects coils 19 and 20, while conductor 34 connects coils 23 and 24. 4

In Fig. 2, the wiring connections and parts are much the same as in Fig. 1. However, in Fig. 2 the line wire 1 connects to one end of coil 20 while conductors 31 and 33 connect to the other, and line wire 2 connects to one end of the coil' 24 while conductors 85 32" and 34 connect to the other. The difference inoperation. will be brought out later. In Fig. 1, assuming key 4 to be open and key 8 to be closed which is the position of sending from B' and repeating at C, then 90 current flows from battery 9 through key 8, relay 7, line 2 to coil 23, and through coil 23 over conductor 28 to battery 29 and ground at 30. This causes electromagnet 21 Vto attractarmature 12. But on account of ever, closes contact at 14. y

Now when key 4 is closed, a closed circuit is established from ground 6, through battery 5, key 4, coil of relay 3, line 1, conductor 33, coil 20, conductor 31, contact 14, and armature 12 to battery 26 and ground at 27. This closes armature 11 to contact 13 and shunts coil 23 across coil 24 by connecting battery 29 through varmature 11, contact 13, conductor 32, coil 24, and conductor 34 t0 line 2.

to operate relay 7. Electromagnet 22 holds armature 12 while coil 23 is shunted so that armature 12 cannot drop back away from 14 and break the holding circuit for armature 11.

With the systemA as above described, the holding coils being practically inde ndent ofthe other coils may have very hig resistance and many turns.v This rmits the use of more turns on the line co' and thus improvestransmission. The action Vwhen key 4 is closed and key 8 is sending is the same as 'ust described, but it is in reverse order.

in he form shown in Fig. 2, the differences in co ection have already been pointed out. Assuming as in the case Just described with Fig. 1 that key 8' is closed so that relay 7 is receiving, coil 23 is energized over the line indicated by the arrows. The current i which will flow throughthe'high resistance coil 23 is insucient to eect relay 7 or to cause suiiicient energization of 24 to enable it to hold armature 12' closed.y Now if key 4 is depressed closing the circuit, coil 20' is immediately energized and attracts its armature 11 so as to close the circuit through from battery 29 over armature 11', contact 13', conductor 32', coil 24', line 2', relay 7', key 8', and battery 9' to ground at 10'. This is a low resistance circult as is readily seen and therefore will permit enough current to niiow to actuate relay 7 as in the case with the diagram shown in Fig. 1. .Coil 23', however, instead of being shunted across the low resistance coil as in Fig. 1 is now short circuited because conductors 34 and 32' are connected through contact 13', armature 11', to conductor 28 direct, thus completely short circuiting coil 23 while coil 24 maintains the armature 12 attracted. When key 4 is again opened, the short circuit for coil 23' is broken at 13 by the deenergization of relay 18 so that coil 23' will againbe energized as before to hold the armature 12 in closed position. When the sending is reversed so that station B is receiving, coil 19' iszshort circuited out in the same manner as coil 23'. e

In Fig. 3, the coils 19" and 20" operate for repeating on a branch line 1". This system is particularly useful in repeating to and from a duplex set. It utilizes a half set in conjunction with a repeating sounder or any other type of relay having an armature and if 6.5 a single contact point such as indicated at This path allows sufficient current to ilowl 35. The closing of the distant duplex line will cause the relay 35 to close which in turn closes armature 36 on contact 37, and, if the key 38 is then closed, armature 39 will make on contact 40 and thus the pole changing relay will close. This type of construction shown in Fig. 3 also shows means whereby the resistance of the holding coil 19' may be varied Without rewinding. Suitable external resistances such as 41 and 42 are provided on the holding coil for this purpose. It is obvious that these resistances may also be similarly applied in the forms shown in Figs. 1 and 2.

From the above descri tion, it is believed that the construction and operation of this device will be clear to those skilled in this art and the advantages thereof readily ap parent.

Having thus described my invention,-what I claim as new and desire to secure by Letters Patent is:

1. Antelegraph repeating system consisting of two telegra h lines, a pair of electro,- magnetic devices ihr each line each having m a coil, said devices controlling a common circuit point in their respective lines, one. of said devices for one line when actuated actuating its armature to establish a circuit to yrepeat im4 ulses to the other teleraph line '95 through t e coil of one only of t e pair of devices of said other telegra h line, the other of said, last named pair o devices serving for relay energizing purposes and being electrically connectedv to the telegraph line. i100 y2. A telegraph repeating system consisting of two telegraph lines, a pair of electromagnetic devices or each line having an armature to repeat impulses to the other telegraph line through the winding of one 0F105 the electromagnetic devices of said other telegraph line, the winding of the other electromagnetic device of each line having a resistance sufficient to prevent energization 0f telegraph relays of its associated line in i110 series therewith, but sufficient ampere turns to attract its associated armature with such energization.

3. A telegraph repeating system consist-y ing of two telegraph lines, a pair of electro- U5 `magnet-ic devices for each hne having an armature to repeat impulses to the other telegraph line through the Winding of one of the electromagnetic devices of said other telegraph line, the winding of the other electx'p-f120 magnetic device of each line having a resistance sufficient to prevent energization of telegraph rela s of its associated line in series therewit but sutlicient ampere turns to attract its associated armature with such energization, said hi h resistance winding being shunted across tie winding of the other of said pair of devices when impulses are being repeated.

4. A telegraph repeating system consisting of two telegraph lines, a pair of electromagnetic devices for each line having an armature to repeat impulses to the other telegraph line through the Winding of one of the electromagnetic devices of said other telegraph line, the Winding ofthe other electromagnetic device of each line having a resistance sui'icient to prevent energization of telegraph relays of its associated line in series therewith, but suicient ampere turns to attract its associated armature With such energization, said high resistance Winding being short-circuited by the energization of the Winding of the other of said pair of devices When the repeater is operating.

In Witness whereof, I hereunto subscribe my name this day of October, A. D. 1981.

ALFRED T. JESTER. 

